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INTRODUCTORY 1

Psychology defined; psychology as a natural science, its data, 1. The human mind and its environment, 3. The postulate that all consciousness has cerebral activity for its condition, 5.

SENSATION IN GENERAL 9

Incoming nerve-currents, 9. Terminal organs, 10. 'Specific energies,' 11. Sensations cognize qualities, 13. Knowledge of acquaintance and knowledge-about, 14. Objects of sensation appear in space, 15. The intensity of sensations, 16. Weber's law, 17. Fechner's law, 21. Sensations are not psychic compounds, 23. The 'law of relativity,' 24. Effects of contrast, 26.

SIGHT 28

The eye, 28. Accommodation, 32. Convergence, binocular vision, 33. Double images, 36. Distance, 39. Size, color, 40. After-images, 43. Intensity of luminous objects, 45.

HEARING 47

The ear, 47. The qualities of sound, 43. Pitch, 44. 'Timbre,' 45. Analysis of compound air-waves, 56. No fusion of elementary sensations of sound, 57. Harmony and discord, 58. Discrimination by the ear, 59.

TOUCH, THE TEMPERATURE SENSE, THE MUSCULAR SENSE, AND PAIN 60

End-organs in the skin, 60. Touch, sense of pressure, 60. Localization, 61. Sensibility to temperature, 63. The muscular sense, 65. Pain, 67.

SENSATIONS OF MOTION 70


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